<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .con {
            width: 200px;
            height: 100px;
            position: relative;
        }

        .con span:nth-child(1) {
            display: block;
            width: 40px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            background-color: yellow;
        }
        

        .con span:nth-child(2) {
            display: block;
            width: 40px;
            height: 40px;
            background-color: green;
        }
        a {
            display: block;
            width: 20px;
            margin-left: 50px;
        }
    </style>
</head>

<body>
    <div class="con">
       <span>121</span>
        <span></span>
        <span></span>
        <span></span>
    </div>
</body>

</html>